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Diffstat (limited to 'include/asm-ia64/uaccess.h')
| -rw-r--r-- | include/asm-ia64/uaccess.h | 401 |
1 files changed, 0 insertions, 401 deletions
diff --git a/include/asm-ia64/uaccess.h b/include/asm-ia64/uaccess.h deleted file mode 100644 index 449c8c0..0000000 --- a/include/asm-ia64/uaccess.h +++ /dev/null @@ -1,401 +0,0 @@ -#ifndef _ASM_IA64_UACCESS_H -#define _ASM_IA64_UACCESS_H - -/* - * This file defines various macros to transfer memory areas across - * the user/kernel boundary. This needs to be done carefully because - * this code is executed in kernel mode and uses user-specified - * addresses. Thus, we need to be careful not to let the user to - * trick us into accessing kernel memory that would normally be - * inaccessible. This code is also fairly performance sensitive, - * so we want to spend as little time doing safety checks as - * possible. - * - * To make matters a bit more interesting, these macros sometimes also - * called from within the kernel itself, in which case the address - * validity check must be skipped. The get_fs() macro tells us what - * to do: if get_fs()==USER_DS, checking is performed, if - * get_fs()==KERNEL_DS, checking is bypassed. - * - * Note that even if the memory area specified by the user is in a - * valid address range, it is still possible that we'll get a page - * fault while accessing it. This is handled by filling out an - * exception handler fixup entry for each instruction that has the - * potential to fault. When such a fault occurs, the page fault - * handler checks to see whether the faulting instruction has a fixup - * associated and, if so, sets r8 to -EFAULT and clears r9 to 0 and - * then resumes execution at the continuation point. - * - * Based on <asm-alpha/uaccess.h>. - * - * Copyright (C) 1998, 1999, 2001-2004 Hewlett-Packard Co - * David Mosberger-Tang <davidm@hpl.hp.com> - */ - -#include <linux/compiler.h> -#include <linux/errno.h> -#include <linux/sched.h> -#include <linux/page-flags.h> -#include <linux/mm.h> - -#include <asm/intrinsics.h> -#include <asm/pgtable.h> -#include <asm/io.h> - -/* - * For historical reasons, the following macros are grossly misnamed: - */ -#define KERNEL_DS ((mm_segment_t) { ~0UL }) /* cf. access_ok() */ -#define USER_DS ((mm_segment_t) { TASK_SIZE-1 }) /* cf. access_ok() */ - -#define VERIFY_READ 0 -#define VERIFY_WRITE 1 - -#define get_ds() (KERNEL_DS) -#define get_fs() (current_thread_info()->addr_limit) -#define set_fs(x) (current_thread_info()->addr_limit = (x)) - -#define segment_eq(a, b) ((a).seg == (b).seg) - -/* - * When accessing user memory, we need to make sure the entire area really is in - * user-level space. In order to do this efficiently, we make sure that the page at - * address TASK_SIZE is never valid. We also need to make sure that the address doesn't - * point inside the virtually mapped linear page table. - */ -#define __access_ok(addr, size, segment) \ -({ \ - __chk_user_ptr(addr); \ - (likely((unsigned long) (addr) <= (segment).seg) \ - && ((segment).seg == KERNEL_DS.seg \ - || likely(REGION_OFFSET((unsigned long) (addr)) < RGN_MAP_LIMIT))); \ -}) -#define access_ok(type, addr, size) __access_ok((addr), (size), get_fs()) - -/* - * These are the main single-value transfer routines. They automatically - * use the right size if we just have the right pointer type. - * - * Careful to not - * (a) re-use the arguments for side effects (sizeof/typeof is ok) - * (b) require any knowledge of processes at this stage - */ -#define put_user(x, ptr) __put_user_check((__typeof__(*(ptr))) (x), (ptr), sizeof(*(ptr)), get_fs()) -#define get_user(x, ptr) __get_user_check((x), (ptr), sizeof(*(ptr)), get_fs()) - -/* - * The "__xxx" versions do not do address space checking, useful when - * doing multiple accesses to the same area (the programmer has to do the - * checks by hand with "access_ok()") - */ -#define __put_user(x, ptr) __put_user_nocheck((__typeof__(*(ptr))) (x), (ptr), sizeof(*(ptr))) -#define __get_user(x, ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr))) - -extern long __put_user_unaligned_unknown (void); - -#define __put_user_unaligned(x, ptr) \ -({ \ - long __ret; \ - switch (sizeof(*(ptr))) { \ - case 1: __ret = __put_user((x), (ptr)); break; \ - case 2: __ret = (__put_user((x), (u8 __user *)(ptr))) \ - | (__put_user((x) >> 8, ((u8 __user *)(ptr) + 1))); break; \ - case 4: __ret = (__put_user((x), (u16 __user *)(ptr))) \ - | (__put_user((x) >> 16, ((u16 __user *)(ptr) + 1))); break; \ - case 8: __ret = (__put_user((x), (u32 __user *)(ptr))) \ - | (__put_user((x) >> 32, ((u32 __user *)(ptr) + 1))); break; \ - default: __ret = __put_user_unaligned_unknown(); \ - } \ - __ret; \ -}) - -extern long __get_user_unaligned_unknown (void); - -#define __get_user_unaligned(x, ptr) \ -({ \ - long __ret; \ - switch (sizeof(*(ptr))) { \ - case 1: __ret = __get_user((x), (ptr)); break; \ - case 2: __ret = (__get_user((x), (u8 __user *)(ptr))) \ - | (__get_user((x) >> 8, ((u8 __user *)(ptr) + 1))); break; \ - case 4: __ret = (__get_user((x), (u16 __user *)(ptr))) \ - | (__get_user((x) >> 16, ((u16 __user *)(ptr) + 1))); break; \ - case 8: __ret = (__get_user((x), (u32 __user *)(ptr))) \ - | (__get_user((x) >> 32, ((u32 __user *)(ptr) + 1))); break; \ - default: __ret = __get_user_unaligned_unknown(); \ - } \ - __ret; \ -}) - -#ifdef ASM_SUPPORTED - struct __large_struct { unsigned long buf[100]; }; -# define __m(x) (*(struct __large_struct __user *)(x)) - -/* We need to declare the __ex_table section before we can use it in .xdata. */ -asm (".section \"__ex_table\", \"a\"\n\t.previous"); - -# define __get_user_size(val, addr, n, err) \ -do { \ - register long __gu_r8 asm ("r8") = 0; \ - register long __gu_r9 asm ("r9"); \ - asm ("\n[1:]\tld"#n" %0=%2%P2\t// %0 and %1 get overwritten by exception handler\n" \ - "\t.xdata4 \"__ex_table\", 1b-., 1f-.+4\n" \ - "[1:]" \ - : "=r"(__gu_r9), "=r"(__gu_r8) : "m"(__m(addr)), "1"(__gu_r8)); \ - (err) = __gu_r8; \ - (val) = __gu_r9; \ -} while (0) - -/* - * The "__put_user_size()" macro tells gcc it reads from memory instead of writing it. This - * is because they do not write to any memory gcc knows about, so there are no aliasing - * issues. - */ -# define __put_user_size(val, addr, n, err) \ -do { \ - register long __pu_r8 asm ("r8") = 0; \ - asm volatile ("\n[1:]\tst"#n" %1=%r2%P1\t// %0 gets overwritten by exception handler\n" \ - "\t.xdata4 \"__ex_table\", 1b-., 1f-.\n" \ - "[1:]" \ - : "=r"(__pu_r8) : "m"(__m(addr)), "rO"(val), "0"(__pu_r8)); \ - (err) = __pu_r8; \ -} while (0) - -#else /* !ASM_SUPPORTED */ -# define RELOC_TYPE 2 /* ip-rel */ -# define __get_user_size(val, addr, n, err) \ -do { \ - __ld_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE); \ - (err) = ia64_getreg(_IA64_REG_R8); \ - (val) = ia64_getreg(_IA64_REG_R9); \ -} while (0) -# define __put_user_size(val, addr, n, err) \ -do { \ - __st_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE, (unsigned long) (val)); \ - (err) = ia64_getreg(_IA64_REG_R8); \ -} while (0) -#endif /* !ASM_SUPPORTED */ - -extern void __get_user_unknown (void); - -/* - * Evaluating arguments X, PTR, SIZE, and SEGMENT may involve subroutine-calls, which - * could clobber r8 and r9 (among others). Thus, be careful not to evaluate it while - * using r8/r9. - */ -#define __do_get_user(check, x, ptr, size, segment) \ -({ \ - const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \ - __typeof__ (size) __gu_size = (size); \ - long __gu_err = -EFAULT; \ - unsigned long __gu_val = 0; \ - if (!check || __access_ok(__gu_ptr, size, segment)) \ - switch (__gu_size) { \ - case 1: __get_user_size(__gu_val, __gu_ptr, 1, __gu_err); break; \ - case 2: __get_user_size(__gu_val, __gu_ptr, 2, __gu_err); break; \ - case 4: __get_user_size(__gu_val, __gu_ptr, 4, __gu_err); break; \ - case 8: __get_user_size(__gu_val, __gu_ptr, 8, __gu_err); break; \ - default: __get_user_unknown(); break; \ - } \ - (x) = (__typeof__(*(__gu_ptr))) __gu_val; \ - __gu_err; \ -}) - -#define __get_user_nocheck(x, ptr, size) __do_get_user(0, x, ptr, size, KERNEL_DS) -#define __get_user_check(x, ptr, size, segment) __do_get_user(1, x, ptr, size, segment) - -extern void __put_user_unknown (void); - -/* - * Evaluating arguments X, PTR, SIZE, and SEGMENT may involve subroutine-calls, which - * could clobber r8 (among others). Thus, be careful not to evaluate them while using r8. - */ -#define __do_put_user(check, x, ptr, size, segment) \ -({ \ - __typeof__ (x) __pu_x = (x); \ - __typeof__ (*(ptr)) __user *__pu_ptr = (ptr); \ - __typeof__ (size) __pu_size = (size); \ - long __pu_err = -EFAULT; \ - \ - if (!check || __access_ok(__pu_ptr, __pu_size, segment)) \ - switch (__pu_size) { \ - case 1: __put_user_size(__pu_x, __pu_ptr, 1, __pu_err); break; \ - case 2: __put_user_size(__pu_x, __pu_ptr, 2, __pu_err); break; \ - case 4: __put_user_size(__pu_x, __pu_ptr, 4, __pu_err); break; \ - case 8: __put_user_size(__pu_x, __pu_ptr, 8, __pu_err); break; \ - default: __put_user_unknown(); break; \ - } \ - __pu_err; \ -}) - -#define __put_user_nocheck(x, ptr, size) __do_put_user(0, x, ptr, size, KERNEL_DS) -#define __put_user_check(x, ptr, size, segment) __do_put_user(1, x, ptr, size, segment) - -/* - * Complex access routines - */ -extern unsigned long __must_check __copy_user (void __user *to, const void __user *from, - unsigned long count); - -static inline unsigned long -__copy_to_user (void __user *to, const void *from, unsigned long count) -{ - return __copy_user(to, (__force void __user *) from, count); -} - -static inline unsigned long -__copy_from_user (void *to, const void __user *from, unsigned long count) -{ - return __copy_user((__force void __user *) to, from, count); -} - -#define __copy_to_user_inatomic __copy_to_user -#define __copy_from_user_inatomic __copy_from_user -#define copy_to_user(to, from, n) \ -({ \ - void __user *__cu_to = (to); \ - const void *__cu_from = (from); \ - long __cu_len = (n); \ - \ - if (__access_ok(__cu_to, __cu_len, get_fs())) \ - __cu_len = __copy_user(__cu_to, (__force void __user *) __cu_from, __cu_len); \ - __cu_len; \ -}) - -#define copy_from_user(to, from, n) \ -({ \ - void *__cu_to = (to); \ - const void __user *__cu_from = (from); \ - long __cu_len = (n); \ - \ - __chk_user_ptr(__cu_from); \ - if (__access_ok(__cu_from, __cu_len, get_fs())) \ - __cu_len = __copy_user((__force void __user *) __cu_to, __cu_from, __cu_len); \ - __cu_len; \ -}) - -#define __copy_in_user(to, from, size) __copy_user((to), (from), (size)) - -static inline unsigned long -copy_in_user (void __user *to, const void __user *from, unsigned long n) -{ - if (likely(access_ok(VERIFY_READ, from, n) && access_ok(VERIFY_WRITE, to, n))) - n = __copy_user(to, from, n); - return n; -} - -extern unsigned long __do_clear_user (void __user *, unsigned long); - -#define __clear_user(to, n) __do_clear_user(to, n) - -#define clear_user(to, n) \ -({ \ - unsigned long __cu_len = (n); \ - if (__access_ok(to, __cu_len, get_fs())) \ - __cu_len = __do_clear_user(to, __cu_len); \ - __cu_len; \ -}) - - -/* - * Returns: -EFAULT if exception before terminator, N if the entire buffer filled, else - * strlen. - */ -extern long __must_check __strncpy_from_user (char *to, const char __user *from, long to_len); - -#define strncpy_from_user(to, from, n) \ -({ \ - const char __user * __sfu_from = (from); \ - long __sfu_ret = -EFAULT; \ - if (__access_ok(__sfu_from, 0, get_fs())) \ - __sfu_ret = __strncpy_from_user((to), __sfu_from, (n)); \ - __sfu_ret; \ -}) - -/* Returns: 0 if bad, string length+1 (memory size) of string if ok */ -extern unsigned long __strlen_user (const char __user *); - -#define strlen_user(str) \ -({ \ - const char __user *__su_str = (str); \ - unsigned long __su_ret = 0; \ - if (__access_ok(__su_str, 0, get_fs())) \ - __su_ret = __strlen_user(__su_str); \ - __su_ret; \ -}) - -/* - * Returns: 0 if exception before NUL or reaching the supplied limit - * (N), a value greater than N if the limit would be exceeded, else - * strlen. - */ -extern unsigned long __strnlen_user (const char __user *, long); - -#define strnlen_user(str, len) \ -({ \ - const char __user *__su_str = (str); \ - unsigned long __su_ret = 0; \ - if (__access_ok(__su_str, 0, get_fs())) \ - __su_ret = __strnlen_user(__su_str, len); \ - __su_ret; \ -}) - -/* Generic code can't deal with the location-relative format that we use for compactness. */ -#define ARCH_HAS_SORT_EXTABLE -#define ARCH_HAS_SEARCH_EXTABLE - -struct exception_table_entry { - int addr; /* location-relative address of insn this fixup is for */ - int cont; /* location-relative continuation addr.; if bit 2 is set, r9 is set to 0 */ -}; - -extern void ia64_handle_exception (struct pt_regs *regs, const struct exception_table_entry *e); -extern const struct exception_table_entry *search_exception_tables (unsigned long addr); - -static inline int -ia64_done_with_exception (struct pt_regs *regs) -{ - const struct exception_table_entry *e; - e = search_exception_tables(regs->cr_iip + ia64_psr(regs)->ri); - if (e) { - ia64_handle_exception(regs, e); - return 1; - } - return 0; -} - -#define ARCH_HAS_TRANSLATE_MEM_PTR 1 -static __inline__ char * -xlate_dev_mem_ptr (unsigned long p) -{ - struct page *page; - char * ptr; - - page = pfn_to_page(p >> PAGE_SHIFT); - if (PageUncached(page)) - ptr = (char *)p + __IA64_UNCACHED_OFFSET; - else - ptr = __va(p); - - return ptr; -} - -/* - * Convert a virtual cached kernel memory pointer to an uncached pointer - */ -static __inline__ char * -xlate_dev_kmem_ptr (char * p) -{ - struct page *page; - char * ptr; - - page = virt_to_page((unsigned long)p); - if (PageUncached(page)) - ptr = (char *)__pa(p) + __IA64_UNCACHED_OFFSET; - else - ptr = p; - - return ptr; -} - -#endif /* _ASM_IA64_UACCESS_H */ |